Spinning



E. GMINDER April 24. 192&

srxmmw Filed Sept. 17. 1925 Web aises:

Patented Apr. 24, 1928.

UNITED STATES PATENT OFFICE.

EHIL GRINDER, OF REUTLINGEN, GERMANY.

srnmmo.

Application filed September 17, 1925, Serial No. 57,038, and in. GermanySeptember 22, 1994.

Spinning machines, and more particularly ring spinning frames,especially those intended for cotton, wool and similar materials, have,as is known, the serious disadvantage that the yarn tension produced asa result of the spinning process acts right up to the front rollers, andthe part of the thread in process of formation and extending partlyround the front lower roller is endangered between the point where thethread leaves the front lower roller and the nipping pointof the frontrollers owing to the fact that this portion does notshare in the twist'or only does so to a very slightextent. This results in comparativelyfrequent breakage of the thread, and this, in the case of fairly longfibres, diminishes the yield and the quality and smoothness of the yarnand, in the case of shorter fibres, such as artificial wool, artificialcotton and the like, makes spinning almost impossible. At the placementioned there also arises, owing to the yarn tension on the one handand of the defective twist onthe other hand, an uncontrollable andtherefore undesirable draft, which, if it does not lead to breakage ofthe thread, frequently causes a thin place in the yarn, which has to betaken into consideration when giving the twist, by unnecessarilyincreasing the co-eflicient of twist.

Numerous attempts to eliminatethese defects, as for example, byinclining the plane of the drawing rollers or of the spindles, byaltering the spindle speed, and by other similar means, have not led tothe desired result, but have brought with them other dis-- terial,because otherwise the true twist canirregularities. In the case ofcarded wool yarn rovings made on the web divider this does not apply,but the danger ofincreasing the rather great irregularity alreadyexisting by emp oying a roller draft is here even greater, for whichreason these rovings have hitherto either not been drawn by means ofrollers at all, or else only by the aid of coniplicated devices, which,by imparting a preliminary twist (spinning tubes and the like) renderpossible the employment of a slight nical improvement, butalso anincrease in economy. Means for carrying out the Process are shown in theaccompanying drawings.

Figures 1 and 2 show diagrammatically,

iniside elevation artly in section) and m plan respectively, rawmgrollers according Y to the invention for flyer frame rovings; while Y IFigures 3 and 4 show corresponding views of drawing rollers according tothe invention for web divided rovings.

Fimu'es 1 and 2 show the apparatus according to the invention as appliedto flyer frame rovings, which alread have a certain preliminary twistfrom the yer frame. The thread in process of production is subjected tothe frictional action of a transversplg moving wire 8 or of a frictionsurface WhlC transmits the twists originating from the spindle 10 rightup to the nipping point of the front rollers 6 and 7. Consequently ahorizontal arrangement of the lane 'of the drawing rollers is possible,wit all Its advantages.

Between the first pair of rollers 1, 2 and the second pair of rollers 4,5 is also arranged a friction surface 3. A 9 pre-, vents the yarn fromslippingo sideways, and in certain cases it is'advisable to provide anadditional pin 12 for the same purpose. From Figure 2 will also be seenthe directionof movement of the friction surfaces 8 and 3, of which 8runs in the twistin direction of the thread, while 3 runs in t eopposite direction.

Figures 3 and 4 illustrate the apphcation of the invention todrawinglrollers for web divider yarns. Between e'first pa1 rof drawingrollers 1, 2 and the second panof drawing rollers 4, 5 are arranged alower face 11, which move in opposite directions.

The friction surfaces move endlessly past all-the threads of the samemachine and may be so arranged as to run in one direction on one side ofthe machine and back on the other side, and on the working side of themachine to run over one driving pulley each. I The working process isarranged as folows:

1. For flying frame racing.

The slightly twisted roving supplied through the first pair of drawingrollers 1, 2 passes over the friction surface 3 to the second pair ofrollers 4, 5. Owing to the fact that the friction surface 3 runs in adirection opposite to the direction of twist of the roving this slighttwisting is loosened and a uniform drawing of this now opened piece ofroving is rendered possible. Between the second pair of rollers 4, 5 andthe front pair of rollers 6, 7 the roving now receives its main draft,and after leaving the nipping point between these two rollers it alsoimmediately receives the spinning twist, which originates from thespindle 10 and is transmitted by the laterally moving friction surface 8to the length of yarn located between the friction surface 8 and thefront pair of rollers 6 and .7. Owing to the sharp deflection of thethread at 8, moreover, the yarn tension produced by the winding-ontraveller is to some extent restrained, and

is therefore smaller in the thrum between the friction surface 8 and thefront pair of rollers 6 and 7 than between the friction surface 8 andthe spindle 10. The pin 9 and, if necessary, the pin 12, prevent thethread from sliding off sideways in the digectiosn of movement of thefriction surace Q. For 'web' divider roof/n9.

The roving is drawn between the first pair of drawing rollers 1, 2 andthe second pair of rollers 4,5. As set forth above, however, that is notpossible in the case of a completely untwisted roving, so a s1ight-socalled false twist is produced in the neighbourhood of the rollers 4 and5 by the friction surfaces 3 and 11 running in opposite tion surfacesuch as 11, moving in the op- -thread, a plurahty of posite direction,may be arranged above the thread. v

What I claim is 1. In a spinning process, deflecting the thread inprocess of formation through approximately a right angle, therebydiminish ing the yarn tension originating from the spindle, imparting aspinning twist to the thread at the spindle and applyingto the thread,at a place where said deflection occurs, a twist in the direction oftwist of the thread imparted by the spindle, said last mentioned twistextending right back to the nipping point.

2. A spinning machine comprising a spin friction surface moving parallelto the draw ing rollers, in the direction of twist of the threadsimparted by the spindle, and in contact' with the thread in theneighborhood of the point of intersection of the axis of the spindle andthe plane of the drawing rollers, said friction surface passingendlessly over all the threads that are being formed in the machine.

4. A spinning machine for web divider rovings, comprising two pairs ofdrawing rollers and two frictlon'surfaces-movlng parallel to the drawingrollers, in opposite directions on opposite sides of the thread, andincontact with the thread between the first and second pairs of drawinrollers, said friction surfaces passing en essly over all the threadsthat are being formed in the machine at different distances from thedrawing rollers, whereby they are not in superposed relationship.

5. The process of spinning, which includes passing the thread fromdrawing rolls to a spindle, imparting to the thread a spinning twist atsaid spindle deflecting the thread at approximately right angles at apoint intermediate of the drawing rolls and the spindle, therebyreducing the thread ten-v sion due to the spindle, and rotating thethread atthe deflection point, in the direc+ tion of the twist of thethread, to transmit to the nipping point of the drawing rolls a portionof the twisting effect of the spindle.

'6. A spinning machine including a spin dle actingto impart a s inningtwlst to the awing rolls and'a wire disposed in the intersection of thespindle axis and the plane of the drawing rolls,

whereby the thread is caused to bend substantially at rightangles inpassing from the drawing rolls to the spindle, said wire being disposedsubstantially parallel. to the drawing rolls and movable endwisetorotate the thread and transmit to the nipping point of the lastdrawing rolls a portion of the twisting elfect imparted to the thread bythe spindle and effect a reduction of the tension of the thread betweensaid wire and the drawing rolls.

7. A spinning machine including a plurality of pairs of drawing rollsanda frictional band movable in a direction parallel to the axes of therolls and between adjacent pairs, said band 't'rielionally engaging withthe thread to el'l'ecta change in the extent of the twist of the latter,and the thread opposite to the band being unsupported whereby the handoffers but slight re,- sistance to the endwise movement of th thread.

8. A spinning machine including a plurality of pairs of drawing rollsand a pair.

-1'0ci'i0l1 to effect a change m the extent of the twist, of the thread,said bands being at different distances from the next succeeding pair ofdrawing rolls, whereby the bands are. not in superposed relationship,and the thread is not gripped between them.

In testimony whereof I have signed-my name to this specification.

EMIL GMINDER.

